Shadows Run Black (1984)

A relentless detective delves into a chilling string of murders linked to a notorious serial killer dubbed "The Black Angel." As he meticulously pieces together the clues, he starts to suspect that these killings may not be mere happenstance but rather part of a larger, more sinister plan. With tension mounting, he races against time to unearth the truth behind the enigmatic figure and unravel the mystery before the body count rises further.